Musculus

Musculus may refer to:
 * Andreas Musculus (1514–1581), German Lutheran theologian
 * Heinrich Musculus (b. 1868), Swedish-Norwegian businessperson
 * Wolfgang Musculus (1497–1563), German Reformed theologian
 * Musculus (bivalve), a genus of mussels
 * Balaenoptera musculus, the blue whale
 * Mus musculus, the house mouse